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/*
* (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved
* (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved
*
* The original version of this source code and documentation is
* copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary
* of IBM. These materials are provided under terms of a License
* Agreement between Taligent and Sun. This technology is protected
* by multiple US and International patents.
*
* This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
package java.awt.font;
import java.awt.geom.AffineTransform;
import java.io.Serializable;
import java.io.ObjectStreamException;
The TransformAttribute class provides an immutable wrapper for a transform so that it is safe to use as an attribute. /**
* The {@code TransformAttribute} class provides an immutable
* wrapper for a transform so that it is safe to use as an attribute.
*/
public final class TransformAttribute implements Serializable {
The AffineTransform for this TransformAttribute, or null if AffineTransform is the identity transform. /**
* The {@code AffineTransform} for this
* {@code TransformAttribute}, or {@code null}
* if {@code AffineTransform} is the identity transform.
*/
private AffineTransform transform;
Wraps the specified transform. The transform is cloned and a reference to the clone is kept. The original transform is unchanged. If null is passed as the argument, this constructor behaves as though it were the identity transform. (Note that it is preferable to use IDENTITY in this case.) Params: - transform – the specified
AffineTransform to be wrapped, or null.
/**
* Wraps the specified transform. The transform is cloned and a
* reference to the clone is kept. The original transform is unchanged.
* If null is passed as the argument, this constructor behaves as though
* it were the identity transform. (Note that it is preferable to use
* {@link #IDENTITY} in this case.)
* @param transform the specified {@link AffineTransform} to be wrapped,
* or null.
*/
public TransformAttribute(AffineTransform transform) {
if (transform != null && !transform.isIdentity()) {
this.transform = new AffineTransform(transform);
}
}
Returns a copy of the wrapped transform.
Returns: an AffineTransform that is a copy of the wrapped transform of this TransformAttribute.
/**
* Returns a copy of the wrapped transform.
* @return an {@code AffineTransform} that is a copy of the wrapped
* transform of this {@code TransformAttribute}.
*/
public AffineTransform getTransform() {
AffineTransform at = transform;
return (at == null) ? new AffineTransform() : new AffineTransform(at);
}
Returns true if the wrapped transform is an identity transform. Returns: true if the wrapped transform is an identity transform; false otherwise.Since: 1.4
/**
* Returns {@code true} if the wrapped transform is
* an identity transform.
* @return {@code true} if the wrapped transform is
* an identity transform; {@code false} otherwise.
* @since 1.4
*/
public boolean isIdentity() {
return transform == null;
}
A TransformAttribute representing the identity transform. Since: 1.6
/**
* A {@code TransformAttribute} representing the identity transform.
* @since 1.6
*/
public static final TransformAttribute IDENTITY = new TransformAttribute(null);
private void writeObject(java.io.ObjectOutputStream s)
throws java.lang.ClassNotFoundException,
java.io.IOException
{
// sigh -- 1.3 expects transform is never null, so we need to always write one out
if (this.transform == null) {
this.transform = new AffineTransform();
}
s.defaultWriteObject();
}
/*
* @since 1.6
*/
private Object readResolve() throws ObjectStreamException {
if (transform == null || transform.isIdentity()) {
return IDENTITY;
}
return this;
}
// Added for serial backwards compatibility (4348425)
static final long serialVersionUID = 3356247357827709530L;
Since: 1.6
/**
* @since 1.6
*/
public int hashCode() {
return transform == null ? 0 : transform.hashCode();
}
Returns true if rhs is a TransformAttribute whose transform is equal to this TransformAttribute's transform. Params: - rhs – the object to compare to
Returns: true if the argument is a TransformAttribute whose transform is equal to this TransformAttribute's transform.Since: 1.6
/**
* Returns {@code true} if rhs is a {@code TransformAttribute}
* whose transform is equal to this {@code TransformAttribute}'s
* transform.
* @param rhs the object to compare to
* @return {@code true} if the argument is a {@code TransformAttribute}
* whose transform is equal to this {@code TransformAttribute}'s
* transform.
* @since 1.6
*/
public boolean equals(Object rhs) {
if (rhs != null) {
try {
TransformAttribute that = (TransformAttribute)rhs;
if (transform == null) {
return that.transform == null;
}
return transform.equals(that.transform);
}
catch (ClassCastException e) {
}
}
return false;
}
}